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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6951df0db2a039a20cd363b437793125184307e6426121dd70ed680bed8eb628' 
  AND token = 'sr8zfxkTkgap+nCRLHo6Jm1Rs5sEruU2zkjo0mDxAZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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