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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a30b91da1f655999c8b1b04a2ee1394ac84c0a4495dfb30bca10e384f4f187a' 
  AND token = '+m4qJPOJbfeaHa+0vcOS0wNDC2GmVvdWEYTwWj091kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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