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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c052e99f93b7fe7d1e138ea49fbef42cae26b9ef5ce835fdf02b5f525df0347c' 
  AND token = '6qtRQhd+uddIHNuwQdJqehsQ/hj++Eghp8tJfSyUtaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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