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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1916d554cf9ff8aecaa7245b511b9201603831c0322945dfbe91de2ac10e63f3' 
  AND token = 'JG5DA1W58kc02st8br1Nrb1Tw3IiRZlsb4JKvXcEqOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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