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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9aa56a6025a39814d4883a40d1497525d2590dfa6f0b2663ea637ef1c8cbf42' 
  AND token = 'M2iiMuHMJhxU1f2ZDIWnli1hiRLY8Mrj9HCTx2Kw8YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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