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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9d25cdc91c9e3c1828c7235ff6d03964854ae805905dd0f1aeb1bf54c1b229a' 
  AND token = 'j6jwUh+AShMehTM6kOmOxcXptkIwMDSk/IxmQ5DPQ2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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