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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30eca354eceaf6c14e98662e3b3317fea6e987b44af0de6d9338561c8b924913' 
  AND token = 'NFwEWuelvdt1yGhU+WHmJMkPUUOWqw/dwqM65XEotIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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