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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96812640a01389c13f8b40563d3d0aaf1dd1bcb0ac5f8b9b0453860c2bafb9dd' 
  AND token = 'jRT6OkO/HnigJEVBXpSUuGSGb8i/GsBZbxaUcErhHCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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