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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edbbcecacf5a19a489c5f7418abacae2407331048854a7cba3e218a20069e912' 
  AND token = 'pLdXf0FuoW01nF4l/AUj+KD7P5uZJthG0dVnJZ30mGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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