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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a5e345e06c1a4eb362b27a8b94864e82f3b07bd904cdc31cd163ad28d0e2a0e' 
  AND token = 'l91TRY4/Y2hBLxTGuPBFcsrM6t+wI08AF2JL0oAe8i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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