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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0307d287395f15f972b592051296bba211d02d6cea4205cf59dae86a4d1a60d5' 
  AND token = 'I5glbySD4kZpbb79Dh2P1+OgeAz6/b/Wgtj9lC7/8oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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