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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad6c473d1240003d58599def2ddb6e786dbe04c4b5ce9f41e0c8f9e8cc2f6121' 
  AND token = '0kmyvRendyS89fBStcZdb6VTJnrxlOV8uf7S7gXyVNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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