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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ebd70d1996d3107166e927968072b5e5a576ae4be613902556926b1ffbe355c' 
  AND token = '0EmZXOIxNCXkZ/rEYec08kT9YYHPt6JRIys7FQbde6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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