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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a227e2170b96c821d4cc9d8f94c90487dcadf764232433d22dfb12f57fac233' 
  AND token = 'dHyGz1FlkEg8hRK9+QM4u43XAodv+azoaMPZuKb0P3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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