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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c34138ca5ddbf32ccc4c0032c7dd2f10a81947e3efa74a8d3bca08a9b457d6e' 
  AND token = 'Z295Ij3gsI8GPo819b93+glm/UP3A7GUywuswIw+gmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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