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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad9dbc23cb4a7cff800e136734f18e90dbf39733e482a6b48299cabf5ed78f66' 
  AND token = 'zaXxg1YEhf3jTH38fUs7GgacKbdU48Dxk9Wx6i7rSrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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