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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c57e65fbc927a4589f60031b0ce4dadc9a6edc8ec975aeec820568d541116c60' 
  AND token = 'DX2x5YJPl3SpnHi12Qr9p1lXJ8Kqk4uK88tQfOsjPOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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