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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '148795ed3280e0f7c8eaf34bb7940f8b26406c28f06d7ba6779fbd1c14734df3' 
  AND token = 'JL8Czdye46xe6OB7RR+kzN8ezbAGLT5zScON4eAYfEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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