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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55dc4c8efbdbde6f1630d999a290dc7f35680641c679b55c5de18a5f478cbddc' 
  AND token = '3s9diVbGWNSWgmIb3+3kxdAXBkVEkmKgkZGg0esqaT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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