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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c2e77bc6079df4237bc943f32e53ee005f3ba2bc1fcfc7dcc280587821ee2e4' 
  AND token = 'OX+03sAseOhRdk2xwCY0Hy16YNG2Gh/R/+CxjFly9CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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