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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af235560956e7c5ef30dd0b62bdad12a1729676314d0185b1231b59cb5c14dce' 
  AND token = 'uYRwxp5TuY7prazPYswq2K1NumkRGqb3NCryhfD5hJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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