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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '567b86988c3919b2a03a9d19a5c7539d8a9ab8cbbb38e4e85c557718e72aeac1' 
  AND token = 'rZhYCogP8TpHzVHbVJm4viLHmFWo93SJ8UbOvSBksKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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