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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2cbdde14cdb03bff152b3e81b7f907b4feb053a1f70ce3d71daa2bd579723be' 
  AND token = '+DSEXPlL2oRkXhNOdA19ie4+oD/A40W+8eN2ClMVRV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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