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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c776d5a400e9cbf1e27c5aeef123d6f472058854a3cd601bf123277f0aca877' 
  AND token = 'ynu//Q2fMfejzKt/7O2kTqo+9xul/bAKptYJsXI71+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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