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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abfdb08abe5dae81949e5580f7427b39c8f222d899bc201673b081ab05c4201a' 
  AND token = '76lneCzqhrClMtFfrdlztYK5vaINaxpINPWEh82SN6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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