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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b8749d695c7794bdd7c1912db53e3743aec67a68cd588f1d6b7fad337ce1715' 
  AND token = 'RqwGdHKv9chG3h/9p85CON4yn2l9Fl3LK4KMAuBuNkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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