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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15b96fcf0cfdde438c20e7f3329e054403dae68936684462b2d06a99ef97f3e3' 
  AND token = '6KeHFE9pMcyiZ3q55f80C81BHlNCLUrN5eWnLzHGNiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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