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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a50a92a91dbef1269b430f0deaffc6bebdfb286a74d3f3a42eff1c433600e30c' 
  AND token = 'v2RQhYiHvfvKkBbt1dyNoYpENWITl3w3C8dwKyChrEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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