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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e731374541470969f2ecc6b54c2b675e1ff3b9c34eeb321f9fd3c0e092fea5a6' 
  AND token = 'cd6R4mWve8xpesgvwUA6zb+ndpKWXoXc+k0AmnWwXHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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