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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e631c3ec8cd4bcd65749fa23aef0e3130034df4043f32787dd5e139471f9be1b' 
  AND token = 'IH1E2hNeoZfYVBPqSpQlfV/G0xMasvfyeB39TUgUNko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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