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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e3267d4e56b6dc29d190ac2f06b22bbcfb2ab7bf13cbe519775789d00c8b573' 
  AND token = 'EuUJ54WfuBCIp0UOBOoxRKd60R5HeCGtbxdcojuQZkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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