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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc34e60c6488cb54a0098df43c571947a4e759cdd47ea42540d144100da5642d' 
  AND token = 'ufXLfx51+kuu7X1wrykgN3VCe6AH2BZnF/DXygJJeFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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