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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e90b46a227c0184f7aefb253fbbe1e02885f85ca82bc680fd027cc8e3ee66f0' 
  AND token = 'AB8HKpSIIsFUlh6SebqidxZHqVCn306GPVaPFknR+3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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