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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c4c2f53f375789fcb298967b70d66487ee4c26c3e9cae327c6c661c7f9be6cb' 
  AND token = 'dKUDrNrHeefoY4pfv4u4i0Ott6TKIAAS+bcnP8Wj0X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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