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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd41f4f6b54a72be558cb05f4be2fc0599d20354c0573f3fdccc845427f99d66d' 
  AND token = 'fanlbRdph9IvyDiu3ArlGkdKUP4rdr5kun+JceHbAgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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