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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3be02165e3cf73f692ad9cdd1f692e2cdeb4e61cb286cdc268ff2f0b81efdaa3' 
  AND token = '0I22PbKUKsq7Heg2/Fb8AlBnTA5rIz+9gug9PKhljaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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