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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '823303054b4e2c561dff0ec26dbd752a72aec181b745c5d2e1ed79c3a4523476' 
  AND token = 'xdREVV0CzZjijFGgk2oVfLAXZA2y+cwOhk154nGj4tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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