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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12508fd2998ba11bc3169b277b15a9b0324717a7c92db499b008fdb1ecc0035b' 
  AND token = 'rTGN9OitzEZeaVwWMYpKBV7cI1JvdP+G08sl5kdaabU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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