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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06dd16f4d1a678a56a1abe81f08b18f2fd968adf1e1bce9bcf4af56b8ca0fdf9' 
  AND token = 'A0/tzE3ZfTWyx+1MJqhtYld1ecKbyHxuk94bYWXwREk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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