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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad0aaeebccd0cc06f72865d9f1f2ef48dc1ccacbb8f6c1e2f52cbef83030076f' 
  AND token = 'aIxlO5DK5j/J3D1U3sMIYyRvtP4noAT3CHAT6dMXbw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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