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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f444dc06f2d1c23c690eb50770b907ebfa8f57344c33175435b9d83a7fc735fd' 
  AND token = 'LLOHXbMb9IKra3oIz4cxF8WaCnE+FvOVPXTB1ew1KhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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