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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4b9f15aac45a1d96f49ae38decf88c0f03f925f12bd382e56c07bae50bc0691' 
  AND token = 'S7PtTA0MPb+30uViZJEJFFN+3TXK0vT3y9AQswrdjwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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