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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3ca10a8cb667b8b73da75cecd2460c358e4c7fe584fbfc91f5e2a51c1b05517' 
  AND token = 'kSyZkx+Om0fU32UwKMMbuLNWAVWdBVzHb5v4Y/tzul0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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