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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4f233051e5b9aba9716559bb7d1506c4479af9cf1f126c8f578500023764333' 
  AND token = '/It/O1SSQRrDtbyGt4j52G1UQ1b0QLhA4Q6+Dm/DAf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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