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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '990b2e33225a4c311e596ec43d3b9f619c45d450b1ebe5746de8eb70e2927e76' 
  AND token = 'IX/0AOo/zaC6Pj/EXG83n8+suqhVsEeLPKy3mEpb2G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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