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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cb393742313b12c9c5988344251fbc1934d474b7e5499aa085557b0761dd029' 
  AND token = 'IGOztrtq565IdZdLbBJmq5yuMtqL4VD0t9XlAA7NVuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}