SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88a6ccf6ca32ae814f961dfc94b43694d178623ffc3e7bd8f05cc3f472333a0d' 
  AND token = 'zE/GYGK60PLCshOrkr9DrmVIKjxbJWStyiuEV5iTClE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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