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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2e1f5cb38d06fbdfd907d30251ea91eb69f879fc40899c5382246b17f60151d' 
  AND token = '9WeJZpCxhHxOR0CSHt0ixOMparmvbHLz8Yk0/+1e4Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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