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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7992bc86d25dae18356d31b22cdf838688a5b186ec422e88e1d514ce91e15a0' 
  AND token = '/Wr/oEEsfdSCd3HlDjDXpbsxtxdKIUzRaYcoqupB6eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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