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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c3565fe497da6554c5a9ad738a940312088a73d0e6e93276f83e42977947757' 
  AND token = '7aoyeYyB/tn9tLsW9mqNsRR3EMRh6iD/+y5QwvG4hD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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